Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

[windychicago]

Dear Sir/Madam

We are planning to use P0.17 (RXD ) and P0.19 (TXD) as serial communication port connecting to Microchip SAM L10 Xplained Pro - Dm320204. I wonder if there is any sample code or UART driver available for nRF52832?

Thanks

Victor

[Jørgen Holmefjord]

Hi,

There are multiple UART examples in the SDK, but none of these uses the UART driver directly.

You can chose from the following examples:

• UART Example - uses app_uart library
• Libuarte Example - Uses Libuarte - advanced UARTE driver library.

If you are planning to send/receiving large amounts of data, I would highly recommend that you use the last example/library. 

The pin configuration can be set in the examples.

Best regards,
Jørgen

[windychicago]

Hi Jorgen

I compiled & ran the Libuarte Example successfully. Will take your recommendation to use UARTE.  Thanks.

Which file(s) contains the pin configuration? Any advice will be appreciated. 

Thanks

Victor

[windychicago]

I found following code in file pca10040.h

// serialization APPLICATION board - temp. setup for running serialized MEMU tests
#define SER_APP_RX_PIN 23 // UART RX pin number.
#define SER_APP_TX_PIN 24 // UART TX pin number.
#define SER_APP_CTS_PIN 2 // UART Clear To Send pin number.
#define SER_APP_RTS_PIN 25 // UART Request To Send pin number.

However, when I search the entire solution, no where uses it.  Is there other place define them? 

Thanks

[Jørgen Holmefjord]

The LIBUARTE example uses the default UART pin configurations from the board header file:

//From main.c

nrf_libuarte_async_config_t nrf_libuarte_async_config = {
        .tx_pin     = TX_PIN_NUMBER,
        .rx_pin     = RX_PIN_NUMBER,

//From pca10040.h

#define RX_PIN_NUMBER  8
#define TX_PIN_NUMBER  6

You can change the pin configurations directly in main.c, either by passing the GPIO numbers directly, or by defining new symbols.

The SER_APP_* defines are used by the serialization solution examples.

[windychicago]

Hi Jorgen

I tried serialization solution examples you mentioned. Connected the two nRF52 development boards as in the instruction of serialization hardware uart. , which is very clear.   Serialization software setup installation are easy to follow too. However, after install Heart Rate application on app board and serialized example project onto connectivity board, then I don't know what & where to look the logs or activity. I used RTT to connect to application board, and no RX/TX activities.  I assume this example will show user how two boards can communicate each other via UART with PINS connected, right?   Further info will be appreciated.

Thanks

Victor